| 摘要 |
A multicasting delivery system and a multicasting delivery method are provided to solve a problem that because scheduling for participating in a multicast group is not considered, a standby time required for changing a program is not sufficiently shortened. Delivery servers(50) multicast-deliver contents via at least one upper router(20A) and a plurality of lower routers(20B). A plurality of client devices(60) reproduce the contents multicast-delivered from the delivery servers. Upper router controllers(30) control the upper routers. A plurality of lower router controllers(40) control the plurality of lower routers. Each client device includes a reproduction history memory unit for storing reproduction history information of contents, an individual contents identifier memory unit for storing identifiers of at least some of contents to be delivered by the delivery servers and session information regarding the multicast delivery of the contents by associating them, a contents acquiring unit for acquiring contents from the delivery server, and a contents reproducing unit for reproducing the acquired contents.
|
